Multiplier
EMT offset multiplier chart
An offset multiplier turns offset height into the distance between the two bend marks. On the WattsCalc card the 30° multiplier is 2.00, the cosecant of 30°. The EMT offset multiplier chart is that column for every angle the offset tab offers.
Mark spacing = offset height × multiplier
Shrink is the other column. It lives on the conduit shrinkage chart. Read it there, then cut. This page does not restate the shrink-per-inch story.
Multiplier chart
| Angle | Multiplier |
|---|---|
| 10° | 5.76 |
| 15° | 3.86 |
| 22.5° | 2.61 |
| 30° | 2.00 |
| 45° | 1.41 |
| 60° | 1.15 |
Keep both decimal places, including 2.00 at 30°. The card and this chart use 5.76, 3.86, 2.61, 2.00, 1.41, and 1.15. Constants follow Klein Tools bending charts. WattsCalc is not affiliated with Klein Tools, Ideal, or Greenlee. Verify on your shoe.
Why 30° is the everyday row
At 30° the multiplier is 2.00, so the marks are double the offset height. The live default is a 6″ offset: 6 × 2.00 = 12″ between marks, which matches the field card. Steeper angles shorten that spacing. The shrink that comes with them is on the shrinkage chart, not in this table.
Worked spacing at 4″ of height
These products are before the tool rounds to the nearest 1/16 inch. Bend radius is not included.
| Angle | Multiplier | Distance between marks |
|---|---|---|
| 22.5° | 2.61 | 4 × 2.61 = 10.44″ |
| 30° | 2.00 | 4 × 2.00 = 8.00″ |
| 45° | 1.41 | 4 × 1.41 = 5.64″ |
The same 4″ height at the other chart rows, still before 1/16-inch rounding: 10° is 4 × 5.76 = 23.04″ between marks, 15° is 4 × 3.86 = 15.44″, and 60° is 4 × 1.15 = 4.60″. The hundredths are part of the chart. A second check at 45°, using 1.41: a 5″ offset is 5 × 1.41 = 7.05″ between marks, again before rounding. Enter the height on the conduit offset calculator when you need the rounded field fraction.
Where the multiplier comes from
Each figure is the cosecant of the bend angle, kept to two decimal places: 1 ÷ sin(angle). That is why 30° is 2.00, because sin 30° is 1/2, and why the chart prints 2.61 at 22.5° and 1.41 at 45°. Multiply by the chart figures. A calculator that shows extra digits will not match the field card, which is built on 5.76, 3.86, 2.61, 2.00, 1.41, and 1.15.
EMT size does not change this column
Hand benders are stamped for thin-wall offsets, which is why the search says EMT. On the offset tab, mark-spacing multipliers follow the angle, not 1/2″, 3/4″, or 1″ trade size. Stub-up take-up does change with size. Typical 90° take-up is 5″, 6″, and 8″ for 1/2″, 3/4″, and 1″ EMT. Verify on your shoe, and do that math on the 90° tab. An offset multiplier applied to a vertical stub will mark the wrong place.
How to use the row on the job
Pick the angle the obstruction allows. Multiply height by the multiplier in the table. That product is the distance between marks. Then take shrink from the shrinkage chart and add it to the run. Shallow 10° spacing is long because the multiplier is 5.76. A 60° row is short because the multiplier is 1.15. The field card prints the active multiplier under the result. Tap it to copy if you are calling the number to someone else on the crew.
Conduit fill is a different calculator. A multiplier does not say whether the pipe is legal to pull. Run fill on its own.
Open the offset tab, tap the angle, and confirm the multiplier line matches this chart before you mark production conduit.
FAQ
What is the 30° multiplier on WattsCalc?
2.00. Distance between marks is double the offset height. A 6″ offset is 12″ between marks.
Do these multipliers change with EMT diameter?
No. On the offset tab they follow the angle. Stub take-up on the 90° tab is the size-specific number.
Can I enter metric?
Yes. The IN/MM switch on the field card converts the display. The multipliers in this chart stay the same.
Where do the figures come from?
Klein Tools bending charts, as cited in the WattsCalc footer. Confirm them on your shoe.
Open the conduit bending calculator
Results are estimates for reference only. Always verify measurements against your bender and local electrical code before cutting or bending conduit.
